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i965: add helper for creating packing writemask

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For example where n=3 first_component=1 this will give us
0xE (WRITEMASK_YZW).

V2:
Add assert to check first component is <= 4 (Suggested by Ken)

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
This commit is contained in:
Timothy Arceri 2016-06-23 12:52:05 +10:00
parent 4b57b53f85
commit 138aad06b3
1 changed files with 7 additions and 0 deletions
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7
src/mesa/drivers/dri/i965/brw_reg.h
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@ -972,6 +972,13 @@ brw_writemask_for_size(unsigned n)
return (1 << n) - 1;
}
static inline unsigned
brw_writemask_for_component_packing(unsigned n, unsigned first_component)
{
assert(first_component + n <= 4);
return (((1 << n) - 1) << first_component);
}
static inline struct brw_reg
negate(struct brw_reg reg)
{